No, the C:\Boot folder is definitely created by Reflect. If you delete that folder and build Rescue Media, you'll see it come right back. The item I'm now not sure about is the Bootmgr file. It's definitely a Windows file, not a Reflect file, since as I said above it has existed since Windows Boot Manager was introduced in Vista to replace NTLDR. But individual BCD entries do not have their own files, and in fact on modern UEFI systems, Windows Boot Manager lives on the EFI partition anyway, not the Windows partition. So I'm not entirely sure why that file is ending up on the root of C on some systems with Reflect installed.